Comparison

Atomic KB vs SoloPDF

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Atomic KB

Features
Read full description

Atomic is a client for your self-hosted Atomic knowledge base. It connects to your own server to give you mobile access to your notes, saved articles, and semantic search. Save any web page from Safari or any browser using the Share Extension — Atomic automatically extracts the article content, generates embeddings, and connects it to your existing knowledge. Features: - Browse, create, and edit markdown notes - Save web articles from any app via the Share Extension - Semantic and hybrid search across your knowledge base - Hierarchical tag browsing - Offline support with local caching - Connect via QR code or manual setup Requires a self-hosted Atomic server. Learn more at https://github.com/kenforthewin/atomic

About

SoloPDF

Features
Read full description

SoloPDF is a clean, fast, fully local PDF reader — no ads, no account, nothing ever uploaded. â€ĸ Reading: multiple tabs, outline, page thumbnails, full-text search, fit-width/fit-page zoom. Huge files open instantly thanks to on-demand loading. â€ĸ Highlights become notes: highlight any text and the annotation is saved as a Markdown notes file (.annotations.md) right next to the PDF — open, edit, and version it with any editor (including our SoloMD). solopdf:// links inside the notes jump straight back to the highlighted passage. â€ĸ Forms: fill AcroForm PDFs (text fields, checkboxes, dropdowns) and save the result. â€ĸ Export to Markdown: turn a whole PDF into a Markdown document, outline headings included. â€ĸ Dark mode with smart page inversion for comfortable night reading. â€ĸ Interface in English, įŽ€äŊ“中文, įšéĢ”ä¸­æ–‡, and æ—ĨæœŦčĒž. Everything runs on your device. No network calls, no data collection.

Screenshots

Atomic KB4 screens
SoloPDF4 screens

Verdict

The call

The clearest difference is device support: SoloPDF at 4 against Atomic KB's 2. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price ¡ Rating ¡ Positive reviews ¡ Number of ratings ¡ Update frequency ¡ Ads ¡ In-app purchases ¡ Monetization ¡ Best chart rank ¡ Devices ¡ Requires iOS

CostPrice ¡ In-app purchases ¡ Ads ¡ Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Atomic KB ships an update every 2 months, SoloPDF monthly. The most recent releases landed on September 18, 2026 and September 24, 2026 respectively.

Scorecard1 real difference ¡ 5 level
Atomic KB versus SoloPDF: the parameters behind the verdict, then further details
ParameterAtomic KBSoloPDF
PriceFreeFree
Update frequencyEvery 2 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS15.015.0
Further details — not scored
Size6 MB14 MB
Age rating4+4+
DeveloperFoldspace Labs LLC向东 李

In-app purchases

None

Atomic KB

No in-app purchases

None

SoloPDF

No in-app purchases

Questions

Is Atomic KB free?
Atomic KB is free to download, with no in-app purchases.
Is SoloPDF free?
SoloPDF is free to download, with no in-app purchases.
Do Atomic KB or SoloPDF have ads?
Neither Atomic KB nor SoloPDF shows ads.
Which is updated more often, Atomic KB or SoloPDF?
Atomic KB ships an update every 2 months, and SoloPDF monthly. Most recently, Atomic KB was updated on September 18, 2026 and SoloPDF on September 24, 2026.

Other comparisons